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May 2, 2015 at 15:00 comment added Zhen Lin I didn't say $\mathcal{C}_{/ X}$ has a terminal object. Rather, $\hat{\mathcal{C}}_{/ X}$ has a terminal object. $\Gamma$ means global sections, of course.
May 2, 2015 at 13:45 comment added bbnkttp Thanks. The first part is clear and I will fill in details myself. About the second part: Why does $\mathcal{C}_{/ X}$ have a terminal object? What do you mean by $\Gamma(-)$?
May 1, 2015 at 21:52 history answered Zhen Lin CC BY-SA 3.0